Melting glaciers, more humid air and eight other key indicators show that global warming is undeniable, scientists said on Wednesday, citing a new comprehensive review of the last decade of climate data.

Using statistical methods borrowed from the insurance industry, researchers at Sandia National Laboratories say they’e calculated the potential economic costs of global warming for each of the lower 48 states.

Colorado's Water Supply Future" was the topic of the workshop that opened the regular monthly meeting of the Colorado Water Conservation Board held Tuesday in the Salida SteamPlant Event Center. The workshop included three presentations by board staff members highlighting data from recently completed technical reports.

Colorado is one of 14 states at risk of having enough water to sustain agricultural needs, according to a study released Tuesday.  In particular, Pueblo County, the Lower Arkansas Valley and Eastern Plains are among the areas to be hardest hit if temperatures increase and water supply dwindles, as predicted by 16 varying climate models.

One out of three U.S. counties is facing a greater risk of water shortages by mid-century due to global warming, finds a new report by Tetra Tech for the Natural Resources Defense Council. For 412 of these counties the risk of water shortages will be "extremely high," according to the report, a 14-fold increase from previous estimates.

Global warming impacts to  tundra regions have been widely studied and the conclusions from the published and peer-reviewed research from around the world are strikingly similar. Warming temperatures will result in a dramatic decline tundra as the tree line climbs higher and shrubs encroach on alpine meadows.

The world has entered a new geologic epoch, in which human activities will largely determine the planet's evolution, reports the United States' chief scientific body, the National Academy of Sciences.

A new National Academy of Sciences study quantifies potential impacts of climate change — linking reduced streamflow, rainfall and crop yields, and more wildfire damage to specific temperature increases. For example, for every 1.8 degrees of warming, Colorado can expect 5 percent to 10 percent less water in the Arkansas River and Rio Grande, the government-funded study found.